Experimental evidence of planar channeling in a periodically bent crystal E. Bagli, L. Bandiera, V. Bellucci, A. Berra, R. Camattari, D. De Salvador, G. Germogli, V. Guidi, L. Lanzoni, D. Lietti et al. (4 more) Eur. Phys. J. C, 74 10 (2014) 3114 Published online: 18 October 2014 DOI: 10.1140/epjc/s10052-014-3114-x